Syringe.



No. 803,640. PATENTED NOV. 7, 1905.

' 0. J. TAGLIABUE.

SYRINGE.

APPLICATION YILED OUT. 6. 1904.

UNITED STATES PATENT oFFIoE.

SYRINGE.

Specification of Letters Patent.

Patented Nov. 7, 1905.

Application filed October 6, 1904. Serial No. 227,335.

To all whom it may concern:

, Be it known that I, CHARLES J. TAGLIABUE, a citizen of the UnitedStates, and a resident of the borough of Brooklyn, county of Kings, andState of New York, have invented certain new and useful Improvements inSyringes, of which the following is a specification.

My invention relates to syringes commonly known as hypodermic syringes,and has for its object to provide a piston for this class of syringeswhich may be expanded to fit the cylinder or barrel more or less snugly.

A specific embodiment of my invention will now be described in detailand the features of novelty pointed out in the appended claims,reference being had to the accompanying drawings, in which Figure l is asectional view of a syringe with my invention applied thereto. Fig. 2 isa detail View of the upper part of the pistonrod with parts in section,and Fig. 3 is a sectional view on line 3 3 of Fig. 1.

A is the usual cylinder or barrel, preferably made of glass, which issecured in the tubular member B in any convenient manner, it beingunderstood that the member B does not entirely surround the tube A. butis made with openings, as shown at B, so that the contents of thecylinder may be seen. As illustrated, the member B is provided at thedischarge end with an inwardly-projecting flange B to hold a washer 0,against which one end of the cylinder A abuts. At its other end themember B is provided with a screwthreaded portion B A nut or cap D,provided with a recess D, is arranged to be screwed upon said member Bto hold the cylinder A in place, washers E being interposed between thelower end of the cylinder A and the nut D. The said not D is providedwith finger-pieces D to permit the syringe to be more easily operated.The member B is also screw-threaded adjacent to the flange B to receivea nut or cap F, a washer F being inserted between the nut F and theouter surface of the flange B The said nut F is provided with a reducedportion or nipple, which is also screw-threaded and upon which isadapted to be screwed the ordinary hypo dermic needle G. The usualpiston-rod H projects through an opening in the nut D into the .cylinderA and is provided at one end with a head I. The piston-rod H is providedwith a reduced portion H, which is screwthreaded in one direction, andwith a still further reduced portion H, which is screwthreaded in theopposite direction, as shown in Fig. 2. A nut J is arranged to be movedup and down on the portion H, and a head or enlargement K is tightlysecured to the end of the portion H Between the nut J and the head K arearranged alternate washers L, made of leather or any suitable expansiblematerial, and metal disks M, it being understood that both the washers Land the disks M fit the portion H loosely. (See Fig. 2.) Assuming nowthat the piston fits the cylinder A loosely and it is desired to havethe said piston fit snugly, all

that is necessary is to screw the nut J up so as to press the washers Land the disks M together, the longitudinal compression of the saidwashers L expanding the same laterally, thus producing a snug fit, theopposite opera- 'tionnamely, the loosening of the nut Jproducing a loosefit of the piston in the cylinder. This loosening or tightening of thenut J may be brought about without taking the syringe apart-that is, bymerely drawing the piston-rod downwardly until the nut J enters theangular recess D of the nut D and then turning the head I of the rod Hin either direction, as may be desired. It is to be understood that therecess D in the nut D is just large enough to accommodate the nut J andprevent it from turning, the openings in the washers being large enoughto permit the nut to pass through into the recess D. By tightly fixingthe head K to the upper end of the rod H it is impossible to entirelyunscrew the parts from each other when adjusting the fit of the piston,or, in other words, there is no danger of the parts becoming entirelyseparated from each other during such adjustment.

Various modifications may be made without departing from the nature ofmy invention.

1 claim as new and desire to secure by Letters Patent- 1. In a syringe,a barrel, a piston-rod movable therein and provided with a reducedportion, a nut screwed on said reduced portion, a second still furtherreduced portion, a head secured to said second-named reduced portion,and a series of alternately-arranged expansible and non-expansible ringssurrounding the said second-named reduced portion between the nut andthe head, said expansible rings being adapted to engage the inside ofthe barrel.

IIO

able therein and provided with a reduced poradapted to engage the insideof the barrel.

tion screw-threaded in one direction, a nut In testimony whereoflhavesigned my name screwed on said reduced portion, a second still to thisspecification in the presence of two sub- 5 further reduced portionscrew-threaded in the scribing witnesses.

2. In asyringe, abarrel apiston-rod movand the head, said expansiblerings being opposite direction, a head screwed upon said CHARLES J TAGLIXBUE second-named reduced portion, and a series f ofalternately-arranged eXpa'nsible and non- Witnesses:

expansible rings surrounding said second- JOHN LoTKA,

IO named reduced portion between the said nut JOHN A. KEHLENBEOK.

